Alright, the more I looked at it I had to do this, crazy complicated picture! Further complicated by a mild fish eye effect, several roofs that look flat but are actually single slant style, curved front steps, offset and broken shingles, and poor resolution.
Each color is another building, and I put random notes on it too.
Also the front center building is a trapezoid! Also not helpful for finding these convergence points!
I left out the buildings in the background, but they all seem to have their own too, well maybe not the grouping of chimneys on the right, looks like those could be treated as one.
But you can tell that even finding the horizon is very difficult with this picture. You really set a hell of a challenge for yourself with it.